[ 'ContractAccount' => '合约账户', ], 'fields' => [ 'user_id' => '用户ID', 'coin_id' => '币种ID', 'coin_name' => '币种名称', 'margin_name' => '保证金', 'usable_balance' => '可用保证金', 'used_balance' => '持仓保证金', 'freeze_balance' => '委托冻结', ], 'options' => [ ], ];